Classify lemlist replies using OpenAI and automate reply handling

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Built by Lucas Perret Lucas Perret
Created on June 05, 2026

Description

Who this is for
This workflow is for sales people who want to quickly and efficiently follow up with their leads

What this workflow does
This workflow starts every time a new reply is received in lemlist. It then classifies the response using openAI and creates the correct follow up task. The follow-up tasks currently include:
Slack alerts when a lead for each new replies
Tag interested leads in lemlist
Unsubscription of leads when they request it

The Slack alerts include:
Lead email address
Sender email address
Reply type (positive, not interested...etc)
A preview of the reply

Setup
To set this template up, simply follow the stickies steps in it

How to customize this workflow to your needs
Adjust the follow up tasks to your needs
Change the Slack notification to your needs
...

Nodes Used (6)

Basic LLM Chain
@n8n/n8n-nodes-langchain.chainLlm
HTTP Request
n8n-nodes-base.httpRequest
Lemlist
n8n-nodes-base.lemlist
OpenAI Chat Model
@n8n/n8n-nodes-langchain.lmChatOpenAi
Slack
n8n-nodes-base.slack
Structured Output Parser
@n8n/n8n-nodes-langchain.outputParserStructured